Avenger (Corgi paperback, £5.99) and Meltdown (Doubleday, hardback, £10.99) by Andy McNab and Robert Rigby.

These books are the third and fourth in the Boy Soldier series written by ex-SAS member and author of Brave Two Zero Andy McNab and scriptwriter and playwright Robert Rigby.

Aimed at older children, they are hard-hitting and gritty adventures featuring 17-year-old Danny Watts and his ex-SAS grandfather Fergus Watts.

In Avenger, Danny, Fergus and Danny's best friend and computer genius Elena are unwittingly recruited by MI5 to hunt down the elusive Black Star, who has been grooming young, vulnerable suicide bombers.

Danny and Elena fly to New York but when Elena finds herself in great danger, Danny and his grandfather must do what they can to save her.

In Meltdown, Danny and Fergus are sucked into a deadly undercover operation to try to track down the people behind a terrifying new drug, whose side-effects are threatening to destabilise society.

The trail of terror leads from Manchester to Spain to Germany - and the pair discover that they are being shadowed by a deadly foe from the past.

These are exciting novels with plenty of action.