Biggles Takes Charge, in which Biggles doesn't appear until about the 50% mark! Algy accidentally becomes embroiled in Ruritanian adventures when he visits the abandoned hunting lodge of a friend (who is secretly the heir of the throne of Moldavia) and meets the friend's cousin, on the run from men who want to kill all the remaining royal heirs to destroy the royalist party!

Either Biggles sense that he's in an enemies-to-lovers story or he's trying to manifest this fate by acting on it hard enough. It seems to be working for him!